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Letters Patent No. 99,650, dated February 8, 1870.

IMPROVlEMENTgIN ANGLE-VALVE COCKS The Schedule referred to n'these Letters Patent and making part of the same.

To all whom it may concern Bc it known that I, JOSEPH H. Davis, of the city and county of Allegheny, and State of Pennsylvania, have invented a certain new and useful article of manufacture, viz, f malleable cast-iron and steel Angle- Valve Cocks and I do hereby declare that the fol- -lowing is a full, clear, and exact description thereof',

tion.

In the accompanying drawings, which form part of' my specification- Figure l is a vertical and longitudinal section of my improvement in angle-valve cocks.

Figure 2 is a side elevation ofthe same.`

lhe body of the angle-valve cock, consisting of the chambers A, B, and B', is Amade in one piece, and is cast in the usual way.. The bore of the chambers A, B, and B are all of the sa'me diameter.

The. inlet g and outlet It are of' such diameter that they will receive pipes, the bore of which may be equal to the opening C for the valve D.

The cap or mounting j, of the valve A, may be made of malleable iron, steel, or brass, and the valve D and its stem may also be made of' the same metals.

The castings for the several parts of the valve should be made of that quality of pig-iron which is suitable for being converted into malleable cast-iron by any of' the known methods, which malleable castings may after\\' ard be subjected to the process ot"ce1nenta tion, and thereby be converted int-0 steel.

The castings, after being properly converted `into malleable cast-iron, are then carefully cleaned, by

placing them in a"rattling|nill or scouring-1nill, such as are used by manufacturers of malleable castings. After being properly cleaned, they are fitted up, so as to finish and complete the valve in all its parts, as shown in the accompanying drawings.

Now, if it is desirable to convert the entire valve, or any ot' its parts, into steel, the different parts are separated, and placed in suitable converting-chests or chambers, and subjected tothe process of cementation, which process is well understood by the skilled metallurgist.

The advantage of constructing angle-valve cocks of malleable cast-iron consists- First, in making a stronger and more durable angie-valve cock than can be made of ordinary cast-iron or brass, for the tensile strength of malleable castiron is greater than either cast-iron or brass.

Second, an angle-valve cock constructed of malleable cast-iron or steel, may be made much lighter than when made of ordinary cast-iron or brass,thercby saving stock and cost of transportation.

Third, an angle-valve cock77 constructed of malleable cast-iron or steel, ashereiubefore described, can be made cheaper than when made of' brass, and isequally susceptible of a fine finish, and at less cost for finishing. Y

Fourth, angle-valve co :ks l of every kind, form, and size, may, with advantage, be-constructed of' malleable cast-i ron or steel, as herein described, which is very difficult to accomplish with ordinary cast-iron.

Fifth, any one or more of the several parts of the angle-valve cook7 may, with ease, facility, and cheapness, be made of' steel, by constructing it or them in the manner hereinbefore'described.

lhe skilful-mechanic and manufacturer of anglevalve cocks will readily see and understand, from the foregoing description of my invention, that my improvement will be of great advantage to the consumer and user of' valve-cocks.

It will be perceived, that the excellence of this angle-valve cock depends upon the use of iron that has passed through the process of annealing, and that for this purpose, malleable iron and steel are, hence, equivalents. I, therefore, do not confine myself to material in either of these stages of manufacture; but

What I claim as a new article of manufacture, is

An angle-valve cock, made of cast-iron, and subsequently annealed, all substantially as4 herein described.

JOS. H. DAVIS.

Witnesses:

A. G. JOHNSTON, JAs. G. TnoMPsoN. 

